Blink: CSS Keyframe Animation | AI CSS Animations

Blink

Hard on, hard off, once a second, like a recording light or an old blink tag. steps(1) makes each switch instant instead of a fade. Keep it for small things: a live dot, a warning icon.

Also known as: css blink animation, blinking animation css, on off blink.

Blink

Color Base size 16px Dark background

HTML

<div class="kfa-blink">Blink</div>

CSS

.kfa-blink {
  --c: var(--kfa-color, #3b82f6);
  font-size: var(--kfa-size, 16px);
  display: grid;
  place-items: center;
  width: 5.5em;
  height: 5.5em;
  border-radius: 1em;
  background: var(--c);
  color: #fff;
  font-family: system-ui, sans-serif;
  font-weight: 700;
  box-shadow: 0 0.6em 1.4em -0.6em color-mix(in srgb, var(--c) 70%, transparent);
  animation: kfa-blink-toggle 1.1s steps(1, end) infinite;
}
@keyframes kfa-blink-toggle {
  0%, 100% { opacity: 1; }
  55% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .kfa-blink, .kfa-blink *, .kfa-blink::before, .kfa-blink::after, .kfa-blink *::before, .kfa-blink *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --kfa-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --kfa-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
Speed: change the duration on the transition or animation shorthand. Staggered delays are relative, so they keep their rhythm.
Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.

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